/**
 *       Copyright (c) 2012 Lukas Zaruba
 *
 *   This file is part of Robot Playground.
 *
 *   Robot Playground is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   Robot Playground is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with Robot Playground. If not, see <http://www.gnu.org/licenses/>.
 */
package net.zarubsys.commons.scripting.functions.numbers;

import java.util.List;

import net.zarubsys.commons.scripting.IScriptFunction;
import net.zarubsys.commons.scripting.ParsedStatement;
import net.zarubsys.commons.scripting.ScriptingEnvironment;
import net.zarubsys.commons.scripting.ScriptingException;

/**
 * Based on scripting language from Media Solutions Slovakia, a.s.
 * @author Lukas Zaruba, lukas.zaruba@gmail.com
 */
public class SubstractFuntion implements IScriptFunction {

	@Override
	public int getMaxArgsNum() {
		return 2;
	}

	@Override
	public int getMinArgsNum() {
		return 2;
	}

	@Override
	public String getName() {
		return "substract";
	}

	@Override
	public Object execute(ScriptingEnvironment env, List<ParsedStatement> args) throws ScriptingException {
		Object n1 = args.get(0).execute(env);
		Object n2 = args.get(1).execute(env);
		if (n1 == null || !(n1 instanceof Integer)) throw new IllegalArgumentException("All arguments of the " + getName() + " function has to be not-null Integer!");
		if (n2 == null || !(n2 instanceof Integer)) throw new IllegalArgumentException("All arguments of the " + getName() + " function has to be not-null Integer!");
		
		return (Integer) n1 - (Integer) n2;
	}

}
